Make Last Name Optional While Entering Hiring Details for a Specific Country

There is a requirement specifying that while hiring an employee, out of the fields required to enter name of employee for hiring, only the first name should be mandatory. So, is it possible to make last name optional for specific country?
Any help is appreciated
Thanks!

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The LAST_NAME field is used throughout the entire HR system and is required. You would have to make over 800 definition changes to make it work. Still want to do it? I would go back to your superiors and tell them "No Way".